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NetBSD/usr.bin/vi/svi/svi_line.c

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/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
/* from: static char sccsid[] = "@(#)svi_line.c 8.18 (Berkeley) 1/22/94"; */
static char *rcsid = "$Id: svi_line.c,v 1.2 1994/01/24 06:41:13 cgd Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <curses.h>
#include <string.h>
#include "vi.h"
#include "svi_screen.h"
#if defined(DEBUG) && 0
#define TABCH '-'
#define TABSTR "--------------------"
#else
#define TABSTR " "
#define TABCH ' '
#endif
/*
* svi_line --
* Update one line on the screen.
*/
int
svi_line(sp, ep, smp, yp, xp)
SCR *sp;
EXF *ep;
SMAP *smp;
size_t *xp, *yp;
{
CHNAME const *cname;
SMAP *tsmp;
size_t chlen, cols_per_screen, cno_cnt, len, scno, skip_screens;
size_t offset_in_char, offset_in_line;
size_t oldy, oldx;
int ch, is_cached, is_infoline, is_partial, is_tab, listset;
char *p, nbuf[10];
#if defined(DEBUG) && 0
TRACE(sp, "svi_line: row %u: line: %u off: %u\n",
smp - HMAP, smp->lno, smp->off);
#endif
/*
* Assume that, if the cache entry for the line is filled in, the
* line is already on the screen, and all we need to do is return
* the cursor position. If the calling routine doesn't need the
* cursor position, we can just return.
*/
is_cached = SMAP_CACHE(smp);
if (yp == NULL && is_cached)
return (0);
/*
* A nasty side effect of this routine is that it returns the screen
* position for the "current" character. Not pretty, but this is the
* only routine that really knows what's out there.
*
* Move to the line. This routine can be called by svi_sm_position(),
* which uses it to fill in the cache entry so it can figure out what
* the real contents of the screen are. Because of this, we have to
* return to whereever we started from.
*/
getyx(stdscr, oldy, oldx);
MOVE(sp, smp - HMAP, 0);
/* Get the character map. */
cname = sp->gp->cname;
/* Get a copy of the line. */
p = file_gline(sp, ep, smp->lno, &len);
/*
* Special case if we're printing the info/mode line. Skip printing
* the leading number, as well as other minor setup. If painting the
* line between two screens, it's always in reverse video. The only
* time this code paints the mode line is when the user is entering
* text for a ":" command, so we can put the code here instead of
* dealing with the empty line logic below. This is a kludge, but it's
* pretty much confined to this module.
*
* Set the number of screens to skip until a character is displayed.
* Left-right screens are special, because we don't bother building
* a buffer to be skipped over.
*
* Set the number of columns for this screen.
*/
cols_per_screen = sp->cols;
if (is_infoline = ISINFOLINE(sp, smp)) {
listset = 0;
if (O_ISSET(sp, O_LEFTRIGHT))
skip_screens = 0;
else
skip_screens = smp->off - 1;
} else {
listset = O_ISSET(sp, O_LIST);
skip_screens = smp->off - 1;
/*
* If O_NUMBER is set and it's line number 1 or the line exists
* and this is the first screen of a folding line or any left-
* right line, display the line number.
*/
if (O_ISSET(sp, O_NUMBER)) {
cols_per_screen -= O_NUMBER_LENGTH;
if ((smp->lno == 1 || p != NULL) && skip_screens == 0) {
(void)snprintf(nbuf,
sizeof(nbuf), O_NUMBER_FMT, smp->lno);
ADDSTR(nbuf);
}
}
}
/*
* Special case non-existent lines and the first line of an empty
* file. In both cases, the cursor position is 0, but corrected
* for the O_NUMBER field if it was displayed.
*/
if (p == NULL || len == 0) {
/* Fill in the cursor. */
if (yp != NULL && smp->lno == sp->lno) {
*yp = smp - HMAP;
*xp = sp->cols - cols_per_screen;
}
/* If the line is on the screen, quit. */
if (is_cached)
goto ret;
/* Set line cacheing information. */
smp->c_sboff = smp->c_eboff = 0;
smp->c_scoff = smp->c_eclen = 0;
if (p == NULL) {
if (smp->lno != 1)
ADDCH(listset && skip_screens == 0 ? '$' : '~');
} else if (listset && skip_screens == 0)
ADDCH('$');
clrtoeol();
MOVEA(sp, oldy, oldx);
return (0);
}
/*
* If we wrote a line that's this or a previous one, we can do this
* much more quickly -- we cached the starting and ending positions
* of that line. The way it works is we keep information about the
* lines displayed in the SMAP. If we're painting the screen in
* the forward, this saves us from reformatting the physical line for
* every line on the screen. This wins big on binary files with 10K
* lines.
*
* Test for the first screen of the line, then the current screen line,
* then the line behind us, then do the hard work. Note, it doesn't
* do us any good to have a line in front of us -- it would be really
* hard to try and figure out tabs in the reverse direction, i.e. how
* many spaces a tab takes up in the reverse direction depends on
* what characters preceded it.
*/
if (smp->off == 1) {
smp->c_sboff = offset_in_line = 0;
smp->c_scoff = offset_in_char = 0;
p = &p[offset_in_line];
} else if (is_cached) {
offset_in_line = smp->c_sboff;
offset_in_char = smp->c_scoff;
p = &p[offset_in_line];
if (skip_screens != 0)
cols_per_screen = sp->cols;
} else if (smp != HMAP &&
SMAP_CACHE(tsmp = smp - 1) && tsmp->lno == smp->lno) {
if (tsmp->c_eclen != tsmp->c_ecsize) {
offset_in_line = tsmp->c_eboff;
offset_in_char = tsmp->c_eclen;
} else {
offset_in_line = tsmp->c_eboff + 1;
offset_in_char = 0;
}
/* Put starting info for this line in the cache. */
smp->c_sboff = offset_in_line;
smp->c_scoff = offset_in_char;
p = &p[offset_in_line];
if (skip_screens != 0)
cols_per_screen = sp->cols;
} else {
offset_in_line = 0;
offset_in_char = 0;
/* This is the loop that skips through screens. */
if (skip_screens == 0) {
smp->c_sboff = offset_in_line;
smp->c_scoff = offset_in_char;
} else for (scno = 0; offset_in_line < len; ++offset_in_line) {
scno += chlen =
(ch = *(u_char *)p++) == '\t' && !listset ?
TAB_OFF(sp, scno) : cname[ch].len;
if (scno < cols_per_screen)
continue;
/*
* Reset cols_per_screen to second and subsequent line
* length.
*/
scno -= cols_per_screen;
cols_per_screen = sp->cols;
/*
* If crossed the last skipped screen boundary, start
* displaying the characters.
*/
if (--skip_screens)
continue;
/* Put starting info for this line in the cache. */
if (scno) {
smp->c_sboff = offset_in_line;
smp->c_scoff = offset_in_char = chlen - scno;
--p;
} else {
smp->c_sboff = ++offset_in_line;
smp->c_scoff = 0;
}
break;
}
}
/*
* Set the number of characters to skip before reaching the cursor
* character. Offset by 1 and use 0 as a flag value. Svi_line is
* called repeatedly with a valid pointer to a cursor position.
* Don't fill anything in unless it's the right line and the right
* character, and the right part of the character...
*/
if (yp == NULL ||
smp->lno != sp->lno || sp->cno < offset_in_line ||
offset_in_line + cols_per_screen < sp->cno) {
cno_cnt = 0;
/* If the line is on the screen, quit. */
if (is_cached)
goto ret;
} else
cno_cnt = (sp->cno - offset_in_line) + 1;
/* This is the loop that actually displays characters. */
for (is_partial = 0, scno = 0;
offset_in_line < len; ++offset_in_line, offset_in_char = 0) {
if ((ch = *(u_char *)p++) == '\t' && !listset) {
scno += chlen = TAB_OFF(sp, scno) - offset_in_char;
is_tab = 1;
} else {
scno += chlen = cname[ch].len - offset_in_char;
is_tab = 0;
}
/*
* Only display up to the right-hand column. Set a flag if
* the entire character wasn't displayed for use in setting
* the cursor. If reached the end of the line, set the cache
* info for the screen. Don't worry about there not being
* characters to display on the next screen, its lno/off won't
* match up in that case.
*/
if (scno >= cols_per_screen) {
smp->c_ecsize = chlen;
chlen -= scno - cols_per_screen;
smp->c_eclen = chlen;
smp->c_eboff = offset_in_line;
if (scno > cols_per_screen)
is_partial = 1;
/* Terminate the loop. */
offset_in_line = len;
}
/*
* If the caller wants the cursor value, and this was the
* cursor character, set the value. There are two ways to
* put the cursor on a character -- if it's normal display
* mode, it goes on the last column of the character. If
* it's input mode, it goes on the first. In normal mode,
* set the cursor only if the entire character was displayed.
*/
if (cno_cnt &&
--cno_cnt == 0 && (F_ISSET(sp, S_INPUT) || !is_partial)) {
*yp = smp - HMAP;
if (F_ISSET(sp, S_INPUT))
*xp = scno - chlen;
else
*xp = scno - 1;
if (O_ISSET(sp, O_NUMBER) &&
!is_infoline && smp->off == 1)
*xp += O_NUMBER_LENGTH;
/* If the line is on the screen, quit. */
if (is_cached)
goto ret;
}
/* If the line is on the screen, don't display anything. */
if (is_cached)
continue;
/*
* Display the character. If it's a tab and tabs aren't some
* ridiculous length, do it fast. (We do tab expansion here
* because curses doesn't have a way to set the tab length.)
*/
if (is_tab) {
if (chlen <= sizeof(TABSTR) - 1) {
ADDNSTR(TABSTR, chlen);
} else
while (chlen--)
ADDCH(TABCH);
} else
ADDNSTR(cname[ch].name + offset_in_char, chlen);
}
if (scno < cols_per_screen) {
/* If didn't paint the whole line, update the cache. */
smp->c_ecsize = smp->c_eclen = cname[ch].len;
smp->c_eboff = len - 1;
/*
* If not the info/mode line, and O_LIST set, and at the
* end of the line, and the line ended on this screen,
* add a trailing $.
*/
if (listset) {
++scno;
ADDCH('$');
}
/* If still didn't paint the whole line, clear the rest. */
if (scno < cols_per_screen)
clrtoeol();
}
ret: MOVEA(sp, oldy, oldx);
return (0);
}
/*
* svi_number --
* Repaint the numbers on all the lines.
*/
int
svi_number(sp, ep)
SCR *sp;
EXF *ep;
{
SMAP *smp;
recno_t lno;
size_t oldy, oldx;
char *lp, *p, nbuf[10];
/*
* Try and avoid getting the last line in the file, by getting the
* line after the last line in the screen -- if it exists, we know
* we have to to number all the lines in the screen. Get the one
* after the last instead of the last, so that the info line doesn't
* fool us.
*
* If that test fails, we have to check each line for existence.
*
* XXX
* The problem is that file_lline will lie, and tell us that the
* info line is the last line in the file.
*/
lp = file_gline(sp, ep, TMAP->lno + 1, NULL);
getyx(stdscr, oldy, oldx);
for (smp = HMAP; smp <= TMAP; ++smp) {
if (smp->off != 1)
continue;
if (ISINFOLINE(sp, smp))
break;
if (smp->lno != 1 && lp == NULL &&
(p = file_gline(sp, ep, smp->lno, NULL)) == NULL)
break;
MOVE(sp, smp - HMAP, 0);
(void)snprintf(nbuf, sizeof(nbuf), O_NUMBER_FMT, smp->lno);
ADDSTR(nbuf);
}
MOVEA(sp, oldy, oldx);
return (0);
}
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